Adelphi University is a private, nonsectarian university located in Garden City, in Nassau County, New York, United States. Adelphi also has Centers in Manhattan, Hudson Valley, and Suffolk County. It is the oldest institution of higher education on Long Island.

Adelphi University comprises a small liberal arts college and a cluster of professional schools that have grown up in close relationship to the needs of the region. Our mission is to provide quality undergraduate and graduate education and to offer professional preparation of the first rank in arts, education, business, clinical psychology, social work, nursing and other health sciences. The University prepares a broad spectrum of graduates and undergraduates for a wide range of life pursuits while fostering a passion for knowledge; an understanding and a questioning of cultural values; and a view of themselves as independent, lifelong learners, and contributors to knowledge and service in an ever-changing world.

Adelphi College Adelphi University began with the Adelphi Academy, founded in Brooklyn, New York in 1863. The academy was a private preparatory school located at 412 Adelphi Street, in the Fort Greene neighborhood of Brooklyn, but later moved to the corner of Lafayette Avenue and Clifton Place, in Clinton Hill. It was formally chartered in 1869 by the Board of Trustees of the City of Brooklyn for establishing "a first class institution for the broadest and most thorough training, and to make its advantages as accessible as possible to the largest numbers of our population."One of the teachers at the Adelphi Academy was Harlan Fiske Stone, who later served as the Chief Justice of the United States. In 1893, Dr. Charles Herbert Levermore was appointed as the head of Adelphi Academy. Seeking to establish a liberal arts college for the City of Brooklyn, Levermore received a charter from the Board of Regents of the State of New York, officially establishing Adelphi College on June 24, 1896. The college received its charter through the efforts of Timothy Woodruff, former Lieutenant Governor of New York and future first president of the Board of Trustees. Adelphi was one of the first coeducational institutions to receive a charter from the State of New York. At the time of its foundation, the college numbered only 57 students and 16 instructors. The Adelphi Academy continued to exist as a separate but nonetheless connected entity to the college.

The new college was located in a building behind the Adelphi Academy, on the corner of St. James's Place and Clifton Place, in Brooklyn. The building that originally housed Adelphi is now used by Pratt Institute for their School of Architecture. In 1912, Adelphi became a women's college. In 1922, the school raised over one million dollars to expand the overcrowded facilities in Brooklyn. In 1925, Adelphi College severed its ties with the Adelphi Academy, the latter closing in 1930. In 1929, the college moved from its founding location in Brooklyn to the current location of its main campus in Garden City, New York. The original "academy" continues to function as a P-12 school in Brooklyn. The original three buildings of the Garden City campus, Levermore Hall, Blodgett Hall and Woodruff Hall, were designed by McKim, Mead and White. In 1938, the Dance Program was founded by the world famous dancer Ruth St. Denis. In 1943, the School of Nursing was established in response to the need for nurses due to American involvement in World War II.

First Lady Eleanor Roosevelt presided over the opening of two federally funded residence halls on campus, in a speech entitled "The Challenge of Nursing for Young Women Today." In 1946, after World War II ended, Adelphi reverted to a coeducational college and started admitting new students on the federal GI Bill. New sports teams were created following the readmission of men to the school. In 1952, the first program for clinical psychology was established at the school; it was also the forerunner to the Institute for Advanced Psychological Studies. Adelphi University In 1963, the New York State Board of Regents granted the college university status, and the name was changed to Adelphi University. In 1964, the School of Business was founded. In 1966, the Institute for Advanced Psychological Studies was founded. In 1973, the University established ABLE (Adult Baccalaureate Learning Experience) for the education of adults. Now known as University College, it was one of the earliest programs created for nontraditional students. In 1984, the Institute for Teaching and Educational Studies was founded; it became the School of Education in 1990. In 1993, the Society of Mentors was established, giving students faculty advisors that they could consult on an as-needed basis to assist them in their studies. In 1995, the Honors College was founded. In January 1963, Adelphi Suffolk College (which had started out in 1955 offering extension courses in Suffolk County, New York) purchased the former W.K. Vanderbilt estate in Oakdale, New York. In 1968 it was spun off to Dowling College after its chief benefactor, Robert Dowling. Adelphi faced a serious scandal in 1996, as the school celebrated its 100th anniversary. University president Peter Diamandopoulos and the Board of Trustees were accused of neglect of duty, misconduct and failure to carry out the educational purposes of Adelphi. The New York State Board of Regents was called in to investigate; Diamandopoulos, along with all but one of the Board of Trustees, was dismissed from office. The university was in dire financial straits until the current president, Dr. Robert A. Scott, was installed in the position in 2000. Scott saved the school by decreasing tuition, increasing scholarships offered for the students, and launching an advertising campaign to increase enrollment.

Since that time, the school has surpassed many of its previous gains, and is said to be undergoing a new renaissance. Adelphi University has been ranked as a "Best Buy" college by the Fiske Guide to Colleges for the last eight years for its quality education offered at a comparatively affordable price. Adelphi University also participates in the National Association of Independent Colleges and Universities's (NAICU) University and College Accountability Network (U-CAN)

Suburban, 75 acres (300,000 m) (304,000 m)

Chris Armas, professional soccer player, Chicago Fire of Major League Soccer and current women's soccer coach at Adelphi. Michael Balboni, Deputy Secretary for Public Safety for the State of New York. Ron Bruder, American entrepreneur who runs Middle East education non-profits, named on the Time 100. Nick Cummings, Ph.D. Past president of the American Psychological Association and founding board chairman of Care Integra, a for-profit company that works with clients to create "integrated healthcare solutions." Author of Eleven Blunders That Have Crippled Psychotherapy in America: A Remedial Unblundering. Robert G. Darling, M.D. Former White House physician during the Bill Clinton presidency. Chuck D (Carlton Ridenhour). Musician, author, lecturer, founder and frontman of the hip-hop group Public Enemy. Gary Dell'Abate, "Baba Booey." Long-time producer of The Howard Stern Show. Meredith Eaton-Gilden, American psychotherapist and actress. Paul Ekman, Ph.D. American psychologist. John Forslund, Television play-by-play announcer for the Carolina Hurricanes of the NHL. Karen Fraction, Broadway dancer and actress. Charles J. Fuschillo, Jr., New York State Senator, 8th District, representing the South Shore of Nassau and Suffolk Counties. Stuart Goldfarb, '76, former President and Chief Executive Officer of BMG Music Service, Columbia House, Book of the Month Club, Literary Guild, Doubleday Book Club; former Executive VP, NBC. Wes Green, professional lacrosse player, Los Angeles Riptide of Major League Lacrosse, and San Jose Stealth of National Lacrosse League. Dr. Marjorie J. Hill, Chief Executive Officer, Gay Men's Health Crisis. Alice Hoffman, New York Times best-selling author. Earlene Hill Hooper, New York State Assemblywoman, 18th District, representing much of Nassau County. Jonathan Larson, creator of the Broadway musical Rent. Michael Lindsay, actor and voice artist Gregory W. Meeks, congressman from New York, 6th District, representing Queens. Donna Orender, women's pro basketball league all-star & current WNBA president Carmen Ortiz, current U.S. Attorney for the District of Massachusetts Billy Phillips, former professional soccer player and coach. Gary Sullivan, professional soccer player, Long Island Rough Riders of the USL First Division. Al Trautwig. sports announcer, member of the Adelphi Athletics Hall of Fame. Rebecca Tobey, sculptor Edolphus Towns, congressman from New York, 10th District, representing Brooklyn. Robert B. Willumstad, former Chairman and CEO, American International Group. Mike Windischmann, soccer, captain of United States World Cup team in 1990. Theresa Wolfson a labor economist and educator, won the John Dewey Award of the League for Industrial Democracy. John D Wren, CEO of Omnicom Group (OMC) William Jonathan Drayton, Jr. (Flavor Flav) Musician, Hypeman for Public Enemy